Portable drill



No. 750,744. PATENTBD JAN'. 26, 1904. J. F. WILLEY.

PORTABLE DRILL.

APPLIOATION HL'ED um. 5, 1903.

No nonnL.

WITNESSE INVENTO Q'/ 711 BY M h u ATTORNEYS UNITED STATES Patented January 26, 1904.

PATENT OFFICE.

PORTABLE DRILL.

SPECIFICATION forming part of Letters Patent No. 750,744, dated January 26, 1904. Application tiled March 5, 1903. Serial No. 146,286. (No model.)

To (1J/Z whom it may con/067%:

Be it known that I, JAMES F. VILLEY, a citizen of the United States, residing at Jeifersonville, in the county of Clark and State of Indiana, have invented certain new and useful Improvements in Portable Drills; and I do hereby declare the following' to be a full, clear, and exact description of the same, such as will enable others skilled in the art to which it appertains to make and use the same.

My invention relates to motor-driven portable drills, and particularly to small portable motor-driven drills of the breast-drill type; and it consists of the novel features of construction of such drills hereinafter described, and particularly pointed out in the claims.

. The objects of my invention are to facilitate the operation of small portable drills, to enable the same to be driven by electric current derived from convenient sources, to simplify the construction of such drills and render the same compact, durable, and relatively light in weight and economical in the use of power, and to protect the revolving parts of the drill from injury and prevent injury of the hands of the workmen thereby.

I will now proceed to describe my invention with reference to the accompanying drawings, illustrating certain forms of my invention, and will then point out the novel features in claims.

In the drawings, Figure 1 shows a central longitudinal section of one form of my improved breastdrill in which speed-reducing gears are interposed between the armatureshaft and the drill-spindle. Fig. 2 is an eX- ternal view of the same drill.

The drawings show a breast-drill, the main portion of which is a hollow casing inclosing the armature of the motor. Said casing is formed in three sections-viz. an intermediate section 1, carrying the lfield-magnets 2 of the motor, and end sections 3 and 4, in which the armature 5 has bearings. The sections of the casing are held together by screws. Section 3 is provided with an extension-boss 9 eccentric with respect to the center of gravity of the drill and to the armature, and in said boss is a bearing in which is mounted the drillspindle 10. Said boss forms a convenient means for grasping the drill by hand for the purpose of guiding it. Section 4 carries the holders 6 for the commutator-brushes 7 and is provided with an operators body-piece or steadying-piece 8, which is in line with the drill-spindle, and therefore is also eccentric to the center of gravity of the drill and to the armature. In the particular instance shown this body-piece is a breast-piece; but other forms of body-piece or steadying-piece may be used. The drill-spindle is driven from the 6o armature-shaft by means of reducing-gears 11 and 12, inclosed within the casing, the scction 3 being suitably formed to contain these gears. Since the gears are thus inclosed, they are protected from injury, it is impossible for the workmans finger or clothing to be caught in them, and the drill may be handled as readily as if no gears were used. The drill is also more simple and compact in appearance than could be the case if the gears were external. 7o

Between the drill-spindle and the said boss 9 there is a bearing-bushing 13. The spindle is provided with a thrust-collar 14. The gear 12 prevents the spindle from being withdrawn from the bearing normally, said gear being 7 5A held in place on the spindle by a nut 15. The spindle may carry any suitable chuck 16 for grasping drills or may be provided with anything else for the same purpose.

Upon the side of the casing opposite the-8o drill-spindle l() and operators body-piece 8 there is a handle 17. By so locating the handle a single handle may be used in place of the two handles ordinarily employed, so that the drill is more compact and may be used in 8 5 Wires for supplying current may enter the 95 casing through a thimble 19 and from thence may reach the brushes through thimbles 20, of which only one is shown.

The particular motor shown 1s of the directcurrent type and is adapted to take current 10G I have not shown any from any ordinary incandescent lighting-circuit by means of a plug fitting into any ordinary lamp-socket. Obviously any other type of direct-current motor may be substituted or any convenient type of alternating-current motor.

The drill is used in the same manner as an ordinary breast-drill except that the workman has simply to hold it in the desired position and by pressing against its breast-piece supply the pressure necessary for drilling. Because of the wide distribution of electriclighting circuits current to operate the drill may be obtained in most places where such drills are used.

It is obvious that my invention is capable of various modifications in construction and arrangement of the parts, and I do not confine myself to the particular construction above described.

By the term operators body-piece used hereinbei'ore and in the following claims I mean any piece or member by which the operator may steady the drill, hold it in position, and press it up to its work either by grasping' such piece with his hand or by pressing any other portion of his body against it.

It is obvious that this drill may be used with suitable tools for other purposes than metal-boring. It may be used, for example, in wood-boring, reaming, tapping, and liucrolling.

What I claim is- 1. In a motor hand-drill, the combination with a motor of the rotary type comprising a rotary driving' member and a casinginclosing the same, said casing having at one end a bearing for a drill-spindle eccentric to the center' of gravity of the drill and of the axis of rotation oit' the driving' member, and at the other end an operators body-piece in line with said bearing; and having also a handle projecting from the side ot' the casing opposite the bearing end oi' the said body-piece; of a spindle within said bearing, and intermcshing gears within the motor-casing mounted on said spindle and on the rotary member of the motor, the drill having also provision for hand-support at a point adjacent the drillspindle, whereby the drill is provided with a three-point support, its center oi' gravity lying within a triangle formed by lines connecting the said points of support.

2. A motor hand-drill comprising the armature and field-magnet of an electric motor, a casing, a drill-spindle, and gearing connecting the same with the said armature, the said casing comprising three members arranged in line with each other and longitudinally bolted together, each of the end members having a bearing for the said armature, one of the said members carrying the drill-spindle, the bearing' therefor in the said member being' a1'- ranged to one side of the armature-bearing, the other of said end members provided with an operators body-piece arranged inline with the said drill-spindle, and the middlemember supporting the field-magnet of the electric motor, whereby upon disconnection of the three casing members the drill-spindle and gear thereupon will be removed with one of the said end members, and the body breastpiece with the other oi' -said members, permitting' free removal of the armature and free access tothe held-magnet supported by the middle member.

In testimony whereof I al'lix my signature in the presence oi' two witnesses.

JAMES F. VILLEY.

Ivitnesses:

JAs. CLARK, Jr., YV. S. GoULD. 

